On a first survey, nothing appears more opposed than these two impulsions; one having for its object change, the other immutability, and yet it is these two notions that exhaust the notion of humanity, and a third fundamental impulsion, holding a medium between them, is quite inconceivable. How then shall we re-establish the unity of human nature, a unity that appears completely destroyed by this primitive and radical opposition?

I admit these two tendencies are contradictory, but it should be noticed that they are not so in the same objects. But things that do not meet cannot come into collision. No doubt the sensuous impulsion desires change; but it does not wish that it should extend to personality and its field, nor that there should be a change of principles. The formal impulsion seeks unity and permanence, but it does not wish the condition to remain fixed with the person, that there should be identity of feeling. Therefore these two impulsions are not divided by nature, and if, nevertheless, they appear so, it is because they have become divided by transgressing nature freely, by ignoring themselves, and by confounding their spheres. The office of culture is to watch over them and to secure to each one its proper limits; therefore culture has to give equal justice to both, and to defend not only the rational impulsion against the sensuous, but also the latter against the former. Hence she has to act a twofold part: first, to protect sense against the attacks of freedom; secondly, to secure personality against the power of sensations. One of these ends is attained by the cultivation of the sensuous, the other by that of reason.

Since the world is developed in time, or change, the perfection of the faculty that places men in relation with the world will necessarily be the greatest possible mutability and extensiveness. Since personality is permanence in change, the perfection of this faculty, which must be opposed to change, will be the greatest possible freedom of action (autonomy) and intensity. The more the receptivity is developed under manifold aspects, the more it is movable and offers surfaces to phenomena, the larger is the part of the world seized upon by man, and the more virtualities he develops in himself. Again, in proportion as man gains strength and depth, and depth and reason gain in freedom, in that proportion man takes in a larger share of the world, and throws out forms outside himself. Therefore his culture will consist, first, in placing his receptivity in contact with the world in the greatest number of points possible, and in raising passivity, to the highest exponent on the side of feeling; secondly, in procuring for the determining faculty the greatest possible amount of independence, in relation to the receptive power, and in raising activity to the highest degree on the side of reason. By the union of these two qualities man will associate the highest degree of self-spontaneity (autonomy) and of freedom with the fullest plenitude of existence, and instead of abandoning himself to the world so as to get lost in it, he will rather absorb it in himself, with all the infinitude of its phenomena, and subject it to the unity of his reason.

But man can invert this relation, and thus fail in attaining his destination in two ways. He can hand over to the passive force the intensity demanded by the active force; he can encroach by material impulsion on the formal impulsion, and convert the receptive into the determining power. He can attribute to the active force the extensiveness belonging to the passive force, he can encroach by the formal impulsion on the material impulsion, and substitute the determining for the receptive power. In the former case, he will never be an Ego, a personality; in the second case, he will never be a Non-Ego, and hence in both cases he will be neither the one nor the other, consequently he will be nothing.

In fact, if the sensuous impulsion becomes determining, if the senses become lawgivers, and if the world stifles personality, he loses as object what he gains in force. It may be said of man that when he is only the contents of time, he is not and consequently he has no other contents. His condition is destroyed at the same time as his personality, because these are two correlative ideas, because change presupposes permanence, and a limited reality implies an infinite reality. If the formal impulsion becomes receptive, that is, if thought anticipates sensation, and the person substitutes itself in the place of the world, it loses as a subject and autonomous force what it gains as object, because immutability implies change, and that to manifest itself also absolute reality requires limits. As soon as man is only form, he has no form, and the personality vanishes with the condition. In a word, it is only inasmuch as he is spontaneous, autonomous, that there is reality out of him, that he is also receptive; and it is only inasmuch as he is receptive that there is reality in him, that he is a thinking force.

Consequently these two impulsions require limits, and looked upon as forces, they need tempering; the former that it may not encroach on the field of legislation, the latter that it may not invade the ground of feeling. But this tempering and moderating the sensuous impulsion ought not to be the effect of physical impotence or of a blunting of sensations, which is always a matter for contempt. It must be a free act, an activity of the person, which by its moral intensity moderates the sensuous intensity, and by the sway of impressions takes from them in depth what it gives them in surface or breadth. The character must place limits to temperament, for the senses have only the right to lose elements if it be to the advantage of the mind. In its turn, the tempering of the formal impulsion must not result from moral impotence, from a relaxation of thought and will, which would degrade humanity. It is necessary that the glorious source of this second tempering should be the fulness of sensations; it is necessary that sensuousness itself should defend its field with a victorious arm and resist the violence that the invading activity of the mind would do to it. In a word, it is necessary that the material impulsion should be contained in the limits of propriety by personality, and the formal impulsion by receptivity or nature.